ASP.NET

Hiiiiiiii  to all

Dear  sir
any one can give link where to get  about THREE TIER project in ASP.NET WEBSERVICES good tutorial and  and also download small project THREE TIER programming in ASP.NET WEBSERVICES

01.//Declaration goes here.
02.Thread SendEmail, CleanOld, MassMailer;
03. 
04.void Application_Start(object sender, EventArgs e)
05.{
06.   //// Code that runs on application startup
07.   SendEmail = new Thread(ArticleEmailTask);
08.   SendEmail.Start();
09.}
10. 
11.void ArticleEmailTask()
12.{
13.    //allow System to load for 5 min.700000
14.    System.Threading.Thread.Sleep(700000);
15.    while (true)
16.    {
17.      if (DateTime.Now.Hour >= 9 && DateTime.Now.Hour <= 10)
18.      {
19.         //Do some Mail sending work
20.      }
21.      else
22.      {
23.        // wait until next time span
24.        System.Threading.Thread.Sleep(3500000);
25.      }
26.    }
27.     
28.}

01.protected void Application_Start(object sender, EventArgs e)
02.{
03.  AddTask("DoStuff", 120);
04.}
05.private static CacheItemRemovedCallback OnCacheRemove = null;
06. 
07.private void AddTask(string name, int seconds)
08.{
09.  OnCacheRemove = new CacheItemRemovedCallback(CacheItemRemoved);
10.  HttpRuntime.Cache.Insert(name, seconds, null,
11.  DateTime.Now.AddSeconds(seconds), Cache.NoSlidingExpiration,
12.  CacheItemPriority.NotRemovable, OnCacheRemove);
13.}
14. 
15.public void CacheItemRemoved(string k, object v, CacheItemRemovedReason r)
16.{
17.  // do stuff here if it matches our taskname, like WebRequest
18.  // re-add our task so it recurs
19.  DoSomeFileWritingStuff();
20.  AddTask(k, Convert.ToInt32(v));
21.}
22. 
23.private void DoSomeFileWritingStuff()
24.{
25.  clsMassMailer objMassmailer = new clsMassMailer();
26.  objMassmailer.NewMassMailTask();
27.}